Huh? I am no biologist (or physicist) but if a bulk(¿) liquid moves against gravity, then surely it needs assistance? Getting the blood in a vessel to "just m

Huh? I am no biologist (or physicist) but if a bulk(¿) liquid moves against gravity, then surely it needs assistance? Getting the blood in a vessel to "just move" if that vessel leads many meters up, has got to be more difficult than if it weren't. ¿ I know capillary effects exist, and plants don't exactly get water up themselves by magic but ...